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【单选题】
It is as risky as the natural evolution of the virus that the scientists breed contagiousness into H5N1 to see if it is likely to happen.A.
Y
B.
N
C.
NG
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A.
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Did you have
C.
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Had you had
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A.
Have;read
B.
Did;read
C.
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D.
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A.
might
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A.
— When did you buy this computer? It looks so new. — I ____it for only a couple of days. A．had
B.
have bought
C.
bought
D.
have had
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A.
have, had
B.
have, bought
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did, buy
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have, have
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A.
Did you go
B.
Have you gone
C.
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D.
Had you gone
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A.
where did you go
B.
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C.
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